package com.jfire.baseutil.validatecode.num;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;

/**
 * 验证码生成器
 * 
 * @author dsna
 *         
 */
public class ValidateCode
{
    // 图片的宽度。
    private int           width        = 160;
    // 图片的高度。
    private int           height       = 40;
    // 验证码字符个数
    private int           codeCount    = 5;
    // 验证码干扰线数
    private int           lineCount    = 150;
    // 验证码
    private String        code         = null;
    // 验证码图片Buffer
    private BufferedImage buffImg      = null;
    private char[]        codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
    
    public ValidateCode()
    {
        this.createCode();
    }
    
    /**
     * 
     * @param width 图片宽
     * @param height 图片高
     */
    public ValidateCode(int width, int height)
    {
        this.width = width;
        this.height = height;
        this.createCode();
    }
    
    /**
     * 
     * @param width 图片宽
     * @param height 图片高
     * @param codeCount 字符个数
     * @param lineCount 干扰线条数
     */
    public ValidateCode(int width, int height, int codeCount, int lineCount)
    {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        this.lineCount = lineCount;
        this.createCode();
    }
    
    public void createCode()
    {
        int x = 0, fontHeight = 0, codeY = 0;
        int red = 0, green = 0, blue = 0;
        
        x = width / (codeCount + 2);// 每个字符的宽度
        fontHeight = height - 2;// 字体的高度
        codeY = height - 4;
        
        // 图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = buffImg.createGraphics();
        // 生成随机数
        Random random = new Random();
        // 将图像填充为白色
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);
        g.setFont(new Font("Arial", Font.PLAIN, fontHeight));
        for (int i = 0; i < lineCount; i++)
        {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width / 8);
            int ye = ys + random.nextInt(height / 8);
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawLine(xs, ys, xe, ye);
        }
        
        // randomCode记录随机产生的验证码
        StringBuffer randomCode = new StringBuffer();
        // 随机产生codeCount个字符的验证码。
        for (int i = 0; i < codeCount; i++)
        {
            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
            // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawString(strRand, (i + 1) * x, codeY);
            // 将产生的四个随机数组合在一起。
            randomCode.append(strRand);
        }
        // 将四位数字的验证码保存到Session中。
        code = randomCode.toString();
    }
    
    public void write(String path) throws IOException
    {
        OutputStream sos = new FileOutputStream(path);
        this.write(sos);
    }
    
    public void write(OutputStream sos) throws IOException
    {
        ImageIO.write(buffImg, "png", sos);
        sos.close();
    }
    
    public BufferedImage getBuffImg()
    {
        return buffImg;
    }
    
    public String getCode()
    {
        return code;
    }
}
